How do the A.I. Builds behave

Solution 1:

Full rush: Just means what it means: the AI will build up forces as soon as possible without researching upgrades through the Engineering Bay, Forge, or Evolution Chamber, trying to finish the game early.

Timing attack: The timing attack depends on the race you're up against. There are several timing attacks programmed into the AI:

Against Protoss: Blink-Stalker, Stalker Robo, Dark Templar, Four Gate.

Against Zerg: Baneling Bust, Roach Rush, Ling Roach, Mutalisk.

Against Terran: Marine Stim, Marine Siegetank, Marauder Helion, Cloaked Banshee.

Aggressive push: I believe (need some input) this mode will do a timing push as well but with everything the AI has with a focus on winning the game on the push ("timing push" means for example getting an upgrade and attacking right as it finishes before the opponent has gotten his own upgrade that would allow him to defend it)

Economic focus: This is the macro mode, building up economy and practising the long game.

Straight to air: Speaks for itself. Rushing an AI opponent that uses this build would be pretty much an automatic win. This mode is for practising air battles.